JPH0238247B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a plate used for solid-liquid separation of a liquid to be treated, a filter incorporating the plate, and a filtering method using the filter. It is something.

[Conventional technology]

Conventionally, as shown in FIG. 8, this type of filter has a frame 1 having a liquid discharge hole 1A formed in its lower edge;
As shown in FIG. 9, a plate 3 consisting of a plate body 2 which extends inside the frame 1 and has liquid guide grooves 2A carved on both sides and an introduction hole 2B for the liquid to be treated in the center is attached to a cloth 4 as shown in FIG.
A chamber 3A surrounded by a cloth 4 is formed between the plates 3, and the liquid to be treated is introduced into each chamber 3A from the introduction path formed by the introduction hole 2B of the frame 1.
The liquid was press-fitted into the frame 1 and passed through the cloth 4, and the liquid was allowed to flow downward through the liquid guide groove 2A of the plate body 2, and was discharged from the liquid drain hole 1A of the frame 1.

[Problem that the invention seeks to solve]

However, in the above conventional example, only the liquid pressure of the liquid to be treated is applied to the chamber 3A.
There was a problem in that the cake accumulated in A was not sufficiently dehydrated, and the cake after the over-step process had to be dehydrated using another device such as a compressor or a centrifugal separator.

[Means for solving problems]

The present invention provides a frame 11, an air bag 12 stretched within the frame 11, a high-pressure air supply path 13 leading to the air bag 12, and a high-pressure air supply path 13 within the frame 11 as a means for solving the above conventional problems. A plate 10 is provided, which includes an introduction path 14 for the liquid to be treated, which leads to a liquid to be treated.
A pair of over-end plates 20A, 20B with liquid discharge passages 22A, 22B connected thereto are opened and closed between the plates 10 and 20A, 20B.
A filter is provided in which a surface is interposed between the frame 11 and a high-pressure air introduction channel 15 is connected to the introduction channel 14 for the liquid to be treated, which leads into the frame 11. The liquid to be treated is press-fitted into the frame 11 of the plate 10 from the treatment liquid introduction path 14 and filtered through the surface, and the liquid is passed through the perforated plates 21A, 21 from the surface.
A passing step in which the liquid flows into the hollow end plates 21A, 20B via B and is discharged from the liquid discharge paths 22A, 22B, and an introduction path 1 for the high pressure air after the passing step.
5 through the introduction path 14 for the liquid to be treated, applying pressure to the cake accumulated on the surface to dehydrate the cake; The purpose of the present invention is to provide a filtration method comprising a pressing and dewatering step in which the cake is compressed and dehydrated by expanding the air bag 12 by applying pressure.

[Effect]

The effects of the present invention based on the above configuration are as follows.

When the liquid to be treated is forced into the frame of the plate from the introduction path, the liquid is filtrated by the surface, the liquid flows into the end plate through the perforated plate, and is discharged from inside the end plate to the drainage path. Cake builds up on the surface. After the over-processing, when high-pressure air pressure is applied to the cake from the high-pressure air introduction path through the treatment liquid introduction path, the treatment liquid remaining in the introduction path is removed by the high-pressure air. At the same time, the pressure of the high-pressure air spreads to the gaps between the solid particles of the cake, and the liquid existing in the gaps is expelled. Furthermore, after the aeration and dehydration step, when pressure is applied to the air bag from the high-pressure air supply path to inflate the air bag, the cake is squeezed between the air bag and the air bag in the same direction as before, and the gaps between the solid particles of the cake are crushed. By squeezing the solid particles, liquid contained within the solid particles is removed.

〔Effect of the invention〕

Therefore, in the present invention, the liquid contained in the cake produced by the passing process is efficiently removed through the two-stage dehydration process of aeration dehydration and press dehydration, so there is no need for subsequent cake dehydration using a separate device. Labor-saving equipment and process steps are required, and the final moisture content of the cake is extremely low, making subsequent drying, incineration, etc. of the cake extremely easy.

〔Example〕

To explain the present invention with reference to an embodiment shown in FIGS. 1 to 7, the plate 10 shown in FIG.
and an air bag 12 stretched within the frame 11.
and a high pressure air supply path 13 leading to the air bag.
and an introduction path 14 for the liquid to be treated that communicates within the frame 11.
As shown in FIG. 2, the air bag 12 is fixed at the top and bottom by fixing pieces 11A of the frame 11.

3 and 4 show a filter machine using the plate 10. In the figure, a pair of end plates 20A and 20B are arranged on both sides of the plate 11, and a hydraulic cylinder 3 is provided on the back side of one end plate 20A.
0 is connected and the over end plate 20A is connected to the hydraulic cylinder 3.
0 allows reciprocating sliding in the directions of arrows A and B in FIG. As shown in FIG. 5, the end plates 20A and 20B have perforated plates 21A and 21B made of wire mesh, punching board, etc. stretched on their inner surfaces, and liquid discharge passages 22A and 22B communicate with each other inside. Further, guide rods 25 and 26 for guiding a material such as cloth or paper are extended to brackets 23 and 24 extended from the upper and lower edges of one end plate 20A. A valve 1 is installed in the high pressure air supply path 13 of the plate 10.
3A, and the introduction path 14 is connected to a pump 14A and a valve 14B, and further communicated with a high-pressure air introduction path 15 having a valve 15A. Board 1
Paper 40A, 40B is interposed between the board 10 and the end plates 20A, 20B, and the paper 40A passes from the feed roll 41A to the guide roll 42A between the plate 10 and the end board 20A. As shown in the figure, the paper 40B passes through the guide rods 25 and 26 while being guided by the guide rolls 25 and 26, and is taken up by the take-up roll 44A via the guide roll 43A. It passes between the end plate 20B and is wound up onto the take-up roll 44B via the guide roll 43B. Scrapers 50A and 50B are arranged in contact with the papers 40A and 40B near the guide rolls 43A and 43B. Furthermore, the end plate 2
The solution discharge passages 22A and 22B of 0A are combined to form the solution discharge passage 22, and a cake receiver 6 is provided below the filter machine.
0 is placed.

In the above configuration, the over-end plate 20A is pushed by the hydraulic cylinder 30 in the direction of the arrow A in FIG. 3 to bring the over-end plate 20B, the plate 10, and the over-end plate 20A into close contact with each other to bring the liquid to be treated into the closed state shown in FIG. The valve 14B of the introduction path 14 is opened and the pump 14A is driven to force the liquid to be treated into the frame 11 of the plate 10. The liquid to be treated passes through the papers 40A and 40B, and the liquid flows into the over-end plates 20A and 20B via the perforated plates 21A and 21B.
A, 20B is discharged to liquid discharge paths 22A, 22B and solution discharge path 22. In this way, the overstep is performed, and when the overstep is finished, the valve 14B of the introduction path 14 is closed and the pump 14A is closed.
and close the valve 15A of the high pressure air introduction path 15.
is opened, and the frame 11 of the plate 10 is inserted through the introduction path 14.
Pressure is exerted on the cake that has accumulated on the papers 40A, 40B within. In this way, the liquid to be treated remaining in the introduction path 14 and the liquid present in the gaps between the solid particles of the cake are driven out by the pressure and are discharged as liquid from the end plates 20A, 20B to the liquid discharge paths 22A, 2.
It is discharged to 2B, 22. After completing the aeration and dehydration process, the valve 13A of the high-pressure air supply path 13 is opened to apply pressure inside the air bag 12, which expands the air bag 12 and compresses the cake between the air bag 12 and the papers 40A and 40B. The liquid still contained in the cake is squeezed out as liquid from the end plates 20A and 20B to the liquid discharge path 22.
A, 22B, 22 are discharged. When the pressing and dewatering process is thus completed, the upper end plate 20A is pulled in the direction of the arrow B in FIG. 3 by the hydraulic cylinder 30.
When the papers 40A and 40B are wound up on take-up rolls 44A and 44B in the open state shown in the figure, the cake adhering to the papers 40A and 40B is scraped off by the scrapers 50A and 50B and placed in the cake receiver 60. Fall. New paper 40A, 40B is placed between the edge plate 20A and the plate 10, and between the edge plate 20B and the plate 10 on the feed rolls 41A, 4.
Sent from 1B. If the length from the guide roll 42A to the guide roll 43A of the paper 40A is kept constant between the open state shown in FIG. 3 and the closed state shown in FIG. will not be pulled or loosened.

When excess sludge sludge from an activated sludge treatment equipment containing 2% solids by weight is overtreated using the above filter, the moisture content of the cake after the overprocessing is 85%, 3.
After the aeration dehydration process for minutes, the moisture content of the cake is 80%,
The moisture content of the cake after 5 minutes of pressing and dehydration process is 78%.
As a comparative example, the same excess sludge waste was subjected to a filtration process using the above-mentioned filtration machine, and then subjected to a compression dehydration process for 1 hour, omitting the aeration dehydration process. As a result, the moisture content of the cake was 80%. Furthermore, in the case of heavy metal-containing sludge (solid content 2% by weight) produced by wastewater treatment discharged from the Metsuki factory, the moisture content of the cake after the over-processing is 85% by weight, and the moisture content of the cake after the 3-minute aeration dehydration process is 85% by weight. The moisture content of the cake was 78% by weight, and the moisture content of the cake after the 5-minute compression dehydration process was 65% by weight.On the other hand, when the aeration dehydration process was omitted and the compression dehydration process was performed for 1 hour, the moisture content of the cake was 68% by weight. It was hot. Therefore, the moisture content of the cake obtained by the method of the present invention is much lower than that of a cake obtained by omitting pressing dehydration or a cake obtained by omitting aeration dehydration even after a short treatment time, and the moisture content of the cake obtained by the method of the present invention is much lower than that of a cake obtained by omitting pressing dehydration or a cake obtained by omitting aeration dehydration. The drying and incineration process is extremely quick, easy and smooth.

Other than the above-mentioned embodiments, in the present invention, a plurality of over-end plates and plates 10 having perforated plates on both sides are arranged alternately, and over-end plates 20A and 20B are provided at both ends.
Alternatively, the conventional plates and the plates of the present invention as shown in FIG. 8 may be arranged alternately.

[Brief explanation of drawings]

Figures 1 to 7 show one embodiment of the present invention. Figure 1 is a front view of the plate, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of the plate in the open state. Schematic diagram of the machine, Fig. 4 is a schematic diagram of the machine in the closed state, Fig. 5
The figures are a sectional view of the vicinity of the plate in the closed state, Figure 6 is a perspective view of the end plate, Figure 7 is a side sectional view of the end plate, Figure 8 is a front view of the conventional plate, and Figure 9 is the same. It is a sectional view of an assembled state. In the diagram 10... board, 11... frame, 12...
Air bag, 13... High pressure air supply path, 14...
...Introduction path for liquid to be treated, 15...Introduction path for compressed air, 20A, 20B...End plate, 21A, 21
B... Porous plate, 22, 22A, 22B... Liquid discharge path.

Claims (1)

[Scope of Claims] 1. A frame, an air bag stretched within the frame, and a high-pressure air supply path leading to the air bag,
A plate consisting of an inlet passage for the liquid to be treated leading into the frame is sandwiched openably and closably between a pair of over-end plates with a perforated plate on the inner surface and connected with a liquid discharge passage, and the plate and the over-end plate are A filtration machine in which a surface is interposed between the frames, and a compressed air introduction path is connected to an introduction path for the liquid to be treated that leads into the frame. 2. A frame, an air bag stretched within the frame, and a high-pressure air supply path leading to the air bag,
A plate consisting of an inlet passage for the liquid to be treated leading into the frame is sandwiched openably and closably between a pair of over-end plates with a perforated plate on the inner surface and connected with a liquid discharge passage, and the plate and the over-end plate are A surface is interposed between the frames, and a compressed air introduction passage is connected to the introduction passage for the liquid to be treated, which leads into the frame. Using a filter, the liquid to be treated is passed from the introduction passage to the frame of the plate. There is a passing step in which the liquid is forced into the inside and passed through the surface, and the liquid flows into the end plate from the surface through the perforated plate and is discharged from the liquid discharge path, and after the passing step, the liquid is passed through the high pressure air introduction path. an aeration dehydration step in which pressure is applied to the cake accumulated on the surface through a liquid introduction path to dehydrate the cake; and after the aeration dehydration step, pressure is applied to the air bag from the high-pressure air supply path to dehydrate the air bag. A filtration method consisting of a compression dehydration step in which the cake is compressed and dehydrated by expansion.